How do you write an event handler in SSIS

First, open your SSIS package in Business Intelligence Development Studio (BIDS) and click on the Event Handlers tab. Next, select the executable/task from the left side combo-box and then select the event you want to write the handler in the right side combo box. Finally, click on the hyperlink to create the event handler. So far you have only created the event handler, you have not specified any sort of action. For that simply drag the required task from the toolbox on the event handler designer surface and configure it appropriately.